Re: [PATCH v2 3/4] loose: lift loose object index writing logic into helper

> Writing the in-memory loose object map to a "loose-object-idx" file is
> handled via `repo_write_loose_object_map()`, which always writes the map
> into the primary object directory. In a subsequent commit, a separate
> "loose-object-idx" file is staged prior to commit and must be
> constructed from a loose object map not attached to the primary loose
> object source.
> 
> Extract the logic for writing a loose object index file into a separate
> `loose_object_map_write()` helper function that allows callers to
> explicitly specify both the loose object map as well as the file
> descriptor to write the entries to.

> diff --git a/loose.c b/loose.c
> index 5f72c644f9..f2e111c25e 100644
> --- a/loose.c
> +++ b/loose.c
> @@ -146,25 +146,17 @@ int repo_read_loose_object_map(struct repository *repo)
>  	return 0;
>  }
>  
> -int repo_write_loose_object_map(struct repository *repo)
> +static int loose_object_map_write(struct repository *repo,
> +				  struct loose_object_map *loose_map, int fd)